US20210173223A1 - Camera module - Google Patents
Camera module Download PDFInfo
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- US20210173223A1 US20210173223A1 US16/924,331 US202016924331A US2021173223A1 US 20210173223 A1 US20210173223 A1 US 20210173223A1 US 202016924331 A US202016924331 A US 202016924331A US 2021173223 A1 US2021173223 A1 US 2021173223A1
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- magnet
- frame
- optical axis
- camera module
- axis direction
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- 238000000034 method Methods 0.000 description 6
- 230000004907 flux Effects 0.000 description 5
- 230000006641 stabilisation Effects 0.000 description 5
- 238000011105 stabilization Methods 0.000 description 5
- 238000010295 mobile communication Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 206010044565 Tremor Diseases 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
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- 238000013461 design Methods 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Images
Classifications
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B5/00—Adjustment of optical system relative to image or object surface other than for focusing
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B5/00—Adjustment of optical system relative to image or object surface other than for focusing
- G03B5/02—Lateral adjustment of lens
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B5/00—Adjustment of optical system relative to image or object surface other than for focusing
- G03B5/04—Vertical adjustment of lens; Rising fronts
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/64—Imaging systems using optical elements for stabilisation of the lateral and angular position of the image
- G02B27/646—Imaging systems using optical elements for stabilisation of the lateral and angular position of the image compensating for small deviations, e.g. due to vibration or shake
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
- G02B7/08—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification adapted to co-operate with a remote control mechanism
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
- G02B7/09—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification adapted for automatic focusing or varying magnification
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B13/00—Viewfinders; Focusing aids for cameras; Means for focusing for cameras; Autofocus systems for cameras
- G03B13/32—Means for focusing
- G03B13/34—Power focusing
- G03B13/36—Autofocus systems
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B17/00—Details of cameras or camera bodies; Accessories therefor
- G03B17/02—Bodies
- G03B17/12—Bodies with means for supporting objectives, supplementary lenses, filters, masks, or turrets
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B3/00—Focusing arrangements of general interest for cameras, projectors or printers
- G03B3/10—Power-operated focusing
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B30/00—Camera modules comprising integrated lens units and imaging units, specially adapted for being embedded in other devices, e.g. mobile phones or vehicles
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K41/00—Propulsion systems in which a rigid body is moved along a path due to dynamo-electric interaction between the body and a magnetic field travelling along the path
- H02K41/02—Linear motors; Sectional motors
- H02K41/035—DC motors; Unipolar motors
- H02K41/0352—Unipolar motors
- H02K41/0354—Lorentz force motors, e.g. voice coil motors
- H02K41/0356—Lorentz force motors, e.g. voice coil motors moving along a straight path
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B2205/00—Adjustment of optical system relative to image or object surface other than for focusing
- G03B2205/0007—Movement of one or more optical elements for control of motion blur
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B2205/00—Adjustment of optical system relative to image or object surface other than for focusing
- G03B2205/0007—Movement of one or more optical elements for control of motion blur
- G03B2205/0015—Movement of one or more optical elements for control of motion blur by displacing one or more optical elements normal to the optical axis
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B2205/00—Adjustment of optical system relative to image or object surface other than for focusing
- G03B2205/0053—Driving means for the movement of one or more optical element
- G03B2205/0069—Driving means for the movement of one or more optical element using electromagnetic actuators, e.g. voice coils
Definitions
- This application relates to a camera module.
- subminiature camera modules in mobile communications terminals such as smartphones, tablet PCs, laptop computers, and the like, has increased.
- An actuator for optical image stabilization may be used to compensate for involuntary shaking introduced due to instability of hands holding the terminals.
- An OIS actuator may move a lens module in a direction, perpendicular to an optical axis direction, to compensate for the involuntary shaking.
- a structure in which a plurality of cameras including a wide-angle camera and a telephoto camera are mounted adjacent to a mobile terminal, has been implemented to improve the performance of camera functions.
- An actuator having a structure provided with a magnet and a coil.
- a structure capable of significantly reducing leakage of a magnetic field while employing an actuator using a magnetic field and a coil for miniaturization and accurate driving.
- a camera module that significantly reduces self-interference such that a plurality of camera modules may be freely arranged even when they are disposed adjacent to each other.
- a camera module in one general aspect, includes a carrier supported on a housing and movable in an optical axis direction, a frame supported on the carrier and movable, relative to the carrier, in a first direction, perpendicular to the optical axis direction, and a lens module supported on the frame and movable, relative to the frame, in a second direction, perpendicular to the optical axis direction.
- One of the frame and the lens module is supported such that attractive force acts in one of the first direction and the second direction.
- the other of the frame and the lens module may be arranged such that attractive force does not act between a relative member and the frame in one of the first direction and the second direction.
- the other of the frame and the lens module may be arranged such that attractive force acts between a relative member and the frame in the optical axis direction.
- the other of the frame and the lens module may include a driving magnet, and the driving magnet may be arranged to have an interval with a yoke, disposed on the relative member, in the optical axis direction.
- the housing may include a side surface on which one of the frame and the lens module is supported, and a yoke formed of a material configured to prevent leakage of a magnetic field may be disposed on the side surface.
- the frame may be supported such that attractive force acts with respect to the carrier in one of the first direction and the second direction, and the lens module maybe supported such that attractive force acts with respect to the frame in the optical axis direction.
- the frame may include a first magnet
- the housing may include a first yoke
- the first magnet and the first yoke may be arranged to have an interval in the second direction.
- the frame may include a first magnet, and the first magnet may be magnetized along a surface opposing the carrier in one of the first direction and the second direction to have at least an N-pole and an S-pole.
- the lens module may include a second magnet, and a surface of the second magnet opposing the carrier may be magnetized to a single pole or a plurality of poles.
- the frame may include a first magnet and the lens module may include a second magnet, the first magnet may generate force such that the frame is moved relatively in a direction parallel to a surface opposing the carrier by interaction with a first coil, and the second magnet may generate force such that the lens module is moved relatively in a direction perpendicular to a surface opposing the frame by interaction with a second coil.
- the first magnet and the second magnet may be disposed to oppose each other about an optical axis.
- the lens module may include a second magnet to generate force to move the lens module, and one of a third magnet, independent of the second magnet, and a third yoke, and the frame may include the other of the third magnet and the third yoke to oppose the third magnet or the third yoke in the optical axis direction.
- the camera module may include three rolling members disposed between the lens module and a surface of the frame in the optical axis direction, and the second magnet may be disposed between two rolling members, among the three rolling members, and the third magnet or the third yoke may be disposed closest to the other rolling member.
- the three rolling members may be disposed to approximately form a right triangle.
- a camera module in another general aspect, includes a carrier supported on a housing and movable in an optical axis direction, a frame supported on the carrier and including a first magnet movable, relative to the carrier, in a first direction perpendicular to the optical axis direction, and a lens module supported on the frame and including a second magnet movable, relative to the frame, in a second direction perpendicular to the optical axis direction.
- One of the first magnet and the second magnet is magnetized along a surface opposing a relative member in one of the first direction and the direction to have at least an N-pole and an S-pole.
- the other of the first magnet and the second magnet is magnetized such that the surface opposing the relative member has a single pole or a plurality of poles.
- a camera module in another general aspect, includes an autofocusing part including a carrier disposed on a housing to be movable in an optical axis direction, a shake correction portion including a lens module to be movable, relative to the carrier, in a direction perpendicular to the optical axis direction, and an autofocusing coil to provide driving force to the autofocusing part, and first and second shake correction coils to provide driving force to the shake correction portion.
- the autofocusing coil and the first and second shake correction coils are each disposed on a surface of the housing disposed to be parallel to the optical axis direction.
- the housing includes a plurality of yokes, respectively covering the autofocusing coil and one of the first and second shake correction coils to prevent leakage of a magnetic field.
- a camera module in another general aspect, includes a frame including a first magnet to generate force to move the frame along a first direction perpendicular to an optical axis; a lens holder coupled to the frame and including a second magnet to generate force to move the lens holder relative to the frame along a second direction perpendicular to the optical axis, the second magnet being disposed opposite to the first magnet across the optical axis; and a lens barrel fixed to the lens holder to be moved along the first direction by movement of the frame and to be moved along the second direction by movement of the lens holder relative to the frame.
- One of the first magnet and the second magnet may be a polarizing magnet, and the other of the first magnet and the second magnet may be a single pole magnet.
- the camera module may include a first coil disposed to face the first magnet along the first direction; and a second coil disposed to face the second magnet along the first direction.
- the camera module may include a first yoke disposed to oppose the first magnet along the first direction such that the first coil is interposed between the first yoke and the first magnet; and a second yoke disposed to oppose the second magnet in a direction parallel to the optical axis.
- FIG. 1 is an assembled perspective view of a camera module according to an example.
- FIG. 2 is an exploded perspective view of a camera module according to an example.
- FIG. 3 is an exploded perspective view of a housing and a carrier according to an example.
- FIG. 4 is an exploded perspective view of a housing, a carrier, a frame, and a lens module according to an example.
- FIG. 5 is an assembled perspective view of a housing, a carrier, a frame, and a lens module according to an example.
- FIG. 6 is an exploded perspective view of a housing, a carrier, a frame, and a lens holder according to an example, when viewed from above.
- FIG. 7 is an exploded perspective view of a housing, a carrier, a frame, and a lens holder according to an example, when viewed from below.
- first,” “second,” and “third” may be used herein to describe various members, components, regions, layers, or sections, these members, components, regions, layers, or sections are not to be limited by these terms. Rather, these terms are only used to distinguish one member, component, region, layer, or section from another member, component, region, layer, or section. Thus, a first member, component, region, layer, or section referred to in examples described herein may also be referred to as a second member, component, region, layer, or section without departing from the teachings of the examples.
- spatially relative terms such as “above,” “upper,” “below,” and “lower” may be used herein for ease of description to describe one element's relationship to another element as shown in the figures. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, an element described as being “above” or “upper” relative to another element will then be “below” or “lower” relative to the other element. Thus, the term “above” encompasses both the above and below orientations depending on the spatial orientation of the device.
- the device may also be oriented in other ways (for example, rotated 90 degrees or at other orientations), and the spatially relative terms used herein are to be interpreted accordingly.
- the present disclosure relates to a camera module, and may be applied to portable electronic devices such as mobile communications terminals, smartphones, table PCs, and the like.
- a camera module is an optical device for capturing still or moving images.
- a camera module may include a lens, refracting light reflected from a subject, and a lens driving device moving the lens to adjust a focus or to compensate for the shaking of the camera module while images are captured.
- FIG. 1 is an assembled perspective view of a camera module according to an example
- FIG. 2 is an exploded perspective view of a camera module according to an example.
- a camera module 1000 may include a housing 1100 , a lens module 1500 including a lens barrel 1510 accommodated in the housing 1100 , a lens driving device moving the lens module 1500 , and an image sensor unit 1150 converting light, incident through the lens barrel 1510 , into an electrical signal.
- the camera module 1000 may further include a case 1110 or an upper cover 1301 covering the housing 1100 from above.
- the lens barrel 1510 may be a hollow cylindrical shape allowing a plurality of lenses for capturing a subject to be accommodated therein (the configuration is not limited thereto, and the lens barrel 1510 may have a partially cut exterior, and the inside of the lens barrel 1510 may be provided with a circular lens or a D-cut lens, a lens having one partially cut side), and a plurality of lenses are mounted in the lens barrel 1510 .
- the plurality of lenses is arranged in an amount as large as necessary depending on a design of the lens barrel 1510 , and each of the plurality of lenses has the same or different optical characteristics such as the a refractive index, or the like.
- the lens driving device moves the lens barrel 1510 in an optical axis direction or a direction perpendicular to the optical axis direction.
- the lens driving device may move the lens barrel 1510 in an optical axis direction (a Z-axis direction) to adjust a focus, and may move the lens barrel 1510 in X-axis and Y-axis directions, perpendicular to the optical axis direction (the Z-axis direction), to correct shaking at the time of capturing an image.
- a Z-axis direction an optical axis direction
- Y-axis directions perpendicular to the optical axis direction (the Z-axis direction)
- the lens driving device includes a focusing unit (an autofocusing part) and a shake correction unit (a shake correction portion).
- the image sensor unit 1150 converts light, incident through the lens barrel 1510 , into an electrical signal.
- the image sensor unit 1150 may include an image sensor 1151 and a printed circuit board (PCB) 1153 connected to the image sensor 1151 , and may further include an infrared filter.
- PCB printed circuit board
- the lens module 1500 including the lens barrel 1510 , and the lens driving device are accommodated in the housing 1100 .
- the housing 1100 has a shape with an open top and bottom, and the lens module 1500 and the lens driving device may be accommodated in an internal space of the housing 1100 .
- the image sensor unit 1150 is disposed below the housing 1100 .
- the case 1110 is coupled to the housing 1100 to surround an external surface of the housing 1100 , and serves to protect internal components of the camera module 1000 .
- the case 1110 may serve to shield electromagnetic waves.
- the case 1100 may shield electromagnetic waves generated by the camera module 1000 such that electromagnetic waves do not affect other electronic components in the portable electronic device.
- the case 1100 may shield electromagnetic waves generated by such electronic components such that the electromagnetic waves do not affect the camera module 1000 .
- FIGS. 2 and 3 the focusing unit of the lens driving device according to an example is illustrated.
- the lens driving device includes a focusing unit, moving a carrier 1300 in an optical axis direction to perform autofocusing, and a shake correction unit moving the lens module 1500 disposed inside of the carrier 1300 in a direction perpendicular to the optical axis direction, to perform shake correction.
- the focusing unit has a structure generating driving force to move the carrier 1300 , accommodating the lens module 1500 , in the optical axis direction (the Z-axis direction).
- a driving portion of the focusing unit includes a magnet 1320 and a coil 1330 .
- the magnet 1320 is mounted on the carrier 1300 .
- the magnet 1320 may be mounted on one surface of the carrier 1300 .
- the coil 1330 is mounted in the housing 1100 .
- the coil 1330 may be mounted in the housing 1100 through a substrate 1130 .
- the coil 1330 may be fixed to the substrate 1130 , and the substrate 1130 may be fixed to the housing 1100 in a state in which fixing driving coils of the shake correction unit to described later are also fixed together.
- the magnet 1320 is a movable member mounted on the carrier 1300 to move in the optical axis direction (the Z-axis direction) together with the carrier 1300
- the coil 1330 is a fixed member fixed to the housing 1100 .
- the configuration is not limited thereto, and positions of the magnet 1320 and the coil 1330 are interchangeable with each other.
- the carrier 1300 When power is applied to the coil 1330 , the carrier 1300 may be moved in the optical axis direction (the Z-axis direction) by electromagnetic interaction between the magnet 1320 and the coil 1330 .
- the lens barrel 1510 Since the lens barrel 1510 is accommodated in the carrier 1300 , the lens barrel 1510 is also moved in the optical axis direction (the Z-axis direction) by the movement of the carrier 1300 .
- a rolling member 1370 is disposed between the carrier 1300 and the housing 1100 to reduce friction between the carrier 1300 and the housing 1100 .
- the rolling member 1370 may have a ball shape.
- Rolling members 1370 may be disposed on both sides of the magnet 1320 .
- a yoke 1350 is disposed in the housing 1100 .
- the yoke 1350 is disposed to oppose the magnet 1320 with the coil 1330 interposed therebetween.
- the coil 1330 and the magnet 1320 are disposed to oppose each other, and the yoke 1350 is disposed on a rear surface of the coil 1330 such that the carrier 1300 is closely supported on the housing 1100 with the rolling member 1370 interposed therebetween.
- Attractive force acts between the yoke 1350 and the magnet 1320 in a direction perpendicular to the optical axis direction (the Z-axis direction). Accordingly, the rolling member 1370 may be maintained in a state of contact with the carrier 1300 and the housing 1100 by the attractive force between the yoke 1350 and the magnet 1320 .
- the yoke 1350 may also serve to focus magnetic force of the magnet 1320 , and may prevent magnetic flux from leaking outwardly.
- the example uses a closed loop control method in which a position of the lens barrel 1510 , in further detail, the carrier 1300 , is detected and feed-backed.
- the position sensor 1360 is required for closed loop control.
- the position sensor 1360 may be a hall sensor.
- the position sensor 1360 is disposed inside or outside of the coil 1330 .
- the position sensor 1360 may be mounted on the substrate 1130 on which the coil 1330 is mounted.
- a magnet and a coil may be additionally provided to secure sufficient driving force during focusing.
- an area, in which a magnet is mounted is reduced with the trend for slimming of a camera module, a size of the magnet is decreased, and thus, sufficient driving force required for focusing may not be secured.
- magnets may be respectively attached to the different surface of the carrier 1300 and coils may be respectively provided on different surfaces of the housing 1100 to oppose the magnet.
- sufficient driving force for focusing may be secured even when a camera module is slimmed.
- FIGS. 2 to 7 a shake correction unit of the lens driving device according to an example is illustrated.
- the lens driving device includes a focusing unit, moving the carrier 1300 in an optical axis direction to perform focusing, and a shake correction unit moving the lens module 1500 disposed inside of the carrier 1300 in a direction perpendicular to the optical axis direction, to perform shake correction.
- the shake correction unit has a structure generating driving force to move the lens module 1500 , accommodated in the carrier 1300 , in a first direction (an X-axis direction) and a second direction (a Y-axis direction), perpendicular to the optical axis direction (the Z-axis direction).
- the first direction and the second direction are perpendicular to each other.
- the shake correction unit is used to correct image blurring or video shaking caused by user hand-shake, or the like, when an image or a video is captured. For example, when the shake occurs due to user hand-shake, or the like, at the time of capturing an image, a relative displacement corresponding to the shake is provided to the lens barrel 1510 to correct the shaking. As an example, the shake correction unit corrects the shaking by moving the lens barrel 1510 in a direction perpendicular to an optical axis (a Z axis).
- the shake correction unit includes a frame 1400 and the lens module 1500 sequentially provided in the carrier 1300 .
- the lens module 1500 includes a lens holder 1700 to which the lens barrel 1510 is coupled.
- the carrier 1300 may include the upper cover 1301 covering the frame 1400 and the lens module 1500 from above while they are disposed inside of the carrier 1300 .
- the shake correction unit according to this example may implement a structure in which the lens barrel 1510 may be moved as the frame 1400 and the lens holder 1700 are moved in the second direction (the Y-axis direction) and the first direction (the X-axis direction), respectively.
- the lens holder 1700 to which the lens barrel 1510 is fixed, is moved as the frame 1400 is moved in the second direction (the Y-axis direction) or the lens holder 1700 is moved in the first direction (the X-axis direction).
- the lens barrel 1510 is fixed to the lens holder 1700 , the lens barrel 1510 is moved together with the movement of the lens holder 1700 and the lens barrel 1510 is a member moved while the lens holder 1700 is supported on the frame 1400 . Therefore, the lens barrel 1510 is naturally moved together with the frame 1400 even when the frame 1400 is moved.
- the lens barrel 1510 is moved together to correct shaking.
- a driving portion of the shake correction unit includes a first driving portion, driving the frame 1400 , and a second driving portion driving the lens holder 1700 .
- the frame 1400 is driven while being in closely supported on a surface disposed to be parallel to the optical axis direction of the carrier 1300
- the lens holder 1700 is driven while being closely supported on a surface perpendicular to the optical axis direction.
- the lens holder 1700 may not be closely supported in the direction perpendicular to the optical axis direction, but may be closely supported on a surface disposed to be parallel to the optical axis direction.
- the frame 1400 includes a first magnet 1420 .
- the first magnet 1420 is disposed to oppose a first coil 1430 , provided in the housing 1100 , in a first direction (an X-axis direction) perpendicular to the optical axis direction.
- the first magnet 1420 is magnetized to have at least N and S poles in a second direction (a Y-axis direction) perpendicular to a direction opposing the first coil 1430 (for example, the first magnet 1420 is magnetized such that a surface opposing the first coil 1430 has at least N and S poles in a direction perpendicular to the optical axis). Accordingly, when power is applied to the first coil 1430 , force is generated to move the frame 1400 in the second direction (the Y-axis direction) depending on electromagnetic interaction of the first magnet 1420 and the first coil 1430 .
- the lens holder 1700 is provided with a second magnet 1720 .
- the second magnet 1720 is disposed to oppose a second coil 1730 , provided in the housing 1100 , in the first direction (the X-axis direction) perpendicular to the optical axis direction.
- the first magnet 1420 and a second magnet 1720 are disposed to be substantially parallel to each other. Accordingly, the first magnet 1420 and the second magnet 1720 may be disposed to oppose each other about the optical axis.
- the second magnet 1720 may be magnetized such that a surface, opposing the second coil 1730 , has a single pole of an N or S pole or a plurality of poles including the N and S poles.
- force is generated to move the lens holder 1700 in the first direction (the X-axis direction) by force to push or pull the second magnet 1720 and the second coil 1730 in direction opposing each other according to electromagnetic interaction of the second magnet 1720 and the second coil 1730 .
- the first coil 1430 and the second coil 1730 are fixed to the substrate 1130 together with the driving coil 1330 of the focusing unit, and the substrate 1130 is fixed to the housing 1100 .
- the frame 1400 is closely supported on a sidewall of the carrier 1300 , for example, a surface disposed to be parallel to the optical axis direction, and the lens holder 1700 is closely supported on a surface of the frame 1400 in the optical axis direction, for example, a surface perpendicular to the optical axis direction.
- the frame 1400 is supported on the sidewall of the carrier 1300 by attractive force with a first yoke 1450 provided in the housing 1100 .
- the first yoke 1450 may be a metallic or non-metallic magnetic material to shield a magnetic field, magnetic flux generated by a coil, a magnet, or an interaction thereof may be prevented from leaking outwardly of the camera module 1000 .
- the lens holder 1700 is supported on an upper surface (bottom) of the frame 1400 in the optical axis direction by attraction force with a second yoke 1750 provided in the frame 1400 .
- the first yoke 1450 is disposed to oppose the first magnet 1420 in the direction perpendicular to the optical axis direction, with the first coil 1410 interposed therebetween, and the second yoke 1750 is disposed to oppose the second magnet 1710 in the optical axis direction.
- the first yoke 1450 may be disposed on a rear surface of the first coil 1430 , and may allow the frame 1400 to be closely supported on an internal wall of the carrier 1300 in the direction perpendicular to the optical axis direction, by the attractive force with the first magnet 1420 .
- the second yoke 1750 may allow the lens holder 1700 to be closely supported on an upper surface (a bottom surface) of the frame 1400 in the optical axis direction by the attractive with the second magnet 1720 . Since the second yoke 1750 and the second magnet 1720 are provided on only a portion based on the circumference of the frame 1400 , the lens holder 1700 may be eccentrically supported on the frame 1400 . Thus, a third yoke 1650 and a third magnet 1620 may be selectively provided on the lens holder 1700 and the frame 1400 , respectively, to oppose each other in the optical axis direction.
- the frame 1400 may include a first rolling member 1470 between and internal wall surface of the carrier 1300 (a surface disposed to be parallel to the optical axis direction) and the frame 1400 to be easily moved on the internal wall of the carrier 1300 in a sliding or rolling motion.
- the lens holder 1700 may include a second rolling member 1770 between a surface perpendicular to the frame 1400 in the optical axis direction and the lens holder 1700 to be easily moved in a sliding or rolling motion on an upper surface of the frame 1400 .
- a surface, on which the frame 1400 and the internal wall of the carrier 1300 oppose each other, may be provided with a first guide groove 1475 formed to be elongated in the second direction (the Y-axis direction) such that the first rolling member 2470 is easily moved in a sliding or rolling motion on at least one of the surfaces.
- a surface, on which the lens holder 1700 and the frame 1400 oppose each other, may be provided with a second guide groove 1775 formed to be elongated in the first direction (the X-axis direction) such that the second rolling member 1770 is easily moved in a sliding or rolling motion on at least one of the surfaces.
- the first rolling member 1470 may be provided with one or two first magnets 1420 on external sides of both end portions thereof, respectively, to form a triangle or a quadrangle. Each first rolling member 1470 may be provided with at least one rolling member in each first guide groove 1475 .
- the second rolling member 1770 is provided with a total of three or four rolling members, including two rolling members respectively disposed on both sides of the second magnet 1720 , to form a triangle or a quadrangle. Each second rolling member 1770 may be provided with at least one rolling member in each second guide groove 1775 . When three second rolling members 1770 are provided to form a triangle, they may be arranged to form an approximately right triangle.
- the second magnet 1720 may be provided between two second rolling members 1770 , among the three second rolling members 1770 , to balance suction force in the optical axis direction, and the third magnet 1620 or the third yoke 1650 may be provided to be closest to the remaining one second rolling member 1770 .
- the first and second magnets 1420 and 1720 of the shake correction driving unit including the first driving unit and the second driving unit are mounted on the first and second frames 1400 and 1700 , respectively.
- the first and second coils 1430 and 1730 respectively opposing the first and second magnets 1420 and 1720 , are mounted in the housing 1100 .
- the first and second coils 1430 and 1730 are illustrated as being disposed on a side of the carrier 1300 .
- both of the first and second coils 1430 and 1730 may be mounted in the housing 1100 .
- the first and second magnets 1420 and 1720 are movable members, moving together with the lens module 1500 in a direction perpendicular to the optical axis (the Z-axis), and the first and second coils 1430 and 1730 are fixed members fixed to the housing 1100 .
- the configuration is not limited thereto, and positions of the first and second magnets 1420 and 1720 and the first and second coils 1430 and 1730 are interchangeable with each other.
- the shake correction driving unit may use a closed loop control method in which the positions of the frame 1400 and the lens holder 1700 are continuously sensed and reflected on driving.
- the frame 1400 and the lens holder 1700 may include first and second position sensors 1460 and 1760 , opposing the first and second magnets 1420 and 1470 , to sense the positions of the frame 1400 and the lens holder 1700 .
- the first and second position sensors 1460 and 1760 may be provided inside or by the first and second coils 1430 and 1730 of the substrate 1130 .
- This example includes all structures in which one or two or more first and second coils 1430 and 1730 , opposing the first and second magnets 1420 and 1470 provided on the frame 1400 and the lens holder 1700 , are provided, respectively.
- the amount of magnetic flux may be adjusted to more efficiently prevent leakage of the magnetic flux.
- side surfaces of the housing 1100 using a VCM actuator using a magnet and a coil may all be finished with a yoke, capable of preventing leakage of magnetic flux. As a result, leakage of a magnetic field may be effectively prevented.
- the camera module 1000 has a structure in which the housing 1100 , the carrier 1300 , the frame 1400 and the lens module 1500 are sequentially provided in the optical axis direction, the carrier 1300 is moved in the optical axis direction to implement an autofocusing (AF) function, and the frame 1400 and the lens module 1500 are moved in the first direction and the second direction, perpendicular to the optical axis, from an upper portion of the carrier 1300 to implement optical image stabilization (OIS).
- AF autofocusing
- OF optical image stabilization
- the frame 1400 is moved in a second direction, perpendicular to the optical axis (the Y-axis direction), while being supported on the sidewall of the carrier 1300 parallel to the optical axis direction, and the lens module 1500 (in further detail, the lens barrel 1510 or the lens holder 1700 ) is moved in the first direction (the X-axis direction), perpendicular to the optical axis direction, while being supported on a bottom surface perpendicular to the optical axis direction of the frame 1400 .
- the lens module 1500 in further detail, the lens barrel 1510 or the lens holder 1700
- optical image stabilization OIS
- directions or surfaces of the frame 1400 and the lens module 1500 are interchangeable with each other.
- the frame 1400 may be moved in the second direction (the Y-axis direction), perpendicular to the optical axis, while being supported on a bottom surface, a surface perpendicular to the optical axis direction of the carrier 1300 , and the lens module 1500 (in further detail, the lens barrel 1510 or the lens holder 1700 ) may be moved in the first direction (the X-axis direction), perpendicular to the optical axis, while being supported on the sidewall of the frame 1400 parallel to the optical axis direction.
- the second direction the Y-axis direction
- the lens module 1500 in further detail, the lens barrel 1510 or the lens holder 1700
- the first direction the X-axis direction
- the first magnet 1420 provided in the frame 1400 may be magnetized to an N-pole or an S-pole of a single-pole magnet, or a plurality of poles including the N-pole and the S-pole, and may allow attractive force or repulsive force to be generated between the first coil 1430 , provided in the housing 1100 , and the first magnet 1420 in directions opposing each other.
- the second magnet 1720 provided in the lens module 1500 may use a magnet magnetized to multiple poles including N-pole and S-pole in the direction, perpendicular to the optical axis direction, and the lens module 1500 may be moved along a surface, opposing the second coil 1730 provided in the housing 1100 , in the second direction (the Y-axis direction) perpendicular to the optical axis direction.
- the housing 1100 may be provided with a yoke covering the second coil 1730 , and the second magnet 1720 provided in the lens module 1500 may be closely supported on a sidewall of the frame 1400 , for example, a surface disposed to be parallel to the optical axis direction, by attractive force with the yoke.
- the frame 1400 should be movable in a direction parallel to the direction in which the frame 1400 is closely supported, force significantly greater than attractive force between the lens module 1500 and the frame 1400 may be required by interaction between the first magnet 1420 and the first coil 1430 .
- a yoke may be provided on the frame 1400 , a movable member, rather than the housing 1100 , to prevent attractive force between the yoke and the second magnet 1720 from affecting movement of the frame 1400 .
- the frame 1400 may be provided with a rolling member interposed between the carrier 1300 and a surface perpendicular to the optical axis direction
- the lens module 1500 may be provided with a rolling member interposed between the frame 1400 and the surface perpendicular to the optical axis direction.
- leakage of a magnetic field may be significantly reduced while employing an actuator using a magnet and a coil.
- miniaturization and accuracy in driving of a camera module may be implemented.
- the camera modules may be freely arranged.
Abstract
Description
- This application claims the benefit under 35 USC 119(a) of Korean Patent Application No. 10-2019-0164032 filed on Dec. 10, 2019 in the Korean Intellectual Property Office, the entire disclosure of which is incorporated herein by reference for all purposes.
- This application relates to a camera module.
- The use of subminiature camera modules in mobile communications terminals such as smartphones, tablet PCs, laptop computers, and the like, has increased.
- With the miniaturization of mobile communications terminals, the quality of images obtained by such terminals may be degraded because such terminals are often held by hand while images are captured. To obtain clear images despite instability introduced into images due to the inadvertent shaking of hands holding the terminals, a technology that compensates for the effect of shaking is required.
- An actuator for optical image stabilization (OIS) may be used to compensate for involuntary shaking introduced due to instability of hands holding the terminals. An OIS actuator may move a lens module in a direction, perpendicular to an optical axis direction, to compensate for the involuntary shaking.
- A structure, in which a plurality of cameras including a wide-angle camera and a telephoto camera are mounted adjacent to a mobile terminal, has been implemented to improve the performance of camera functions.
- However, when an OIS actuator using a magnet and a coil is employed for miniaturization and accuracy in driving, performance is deteriorated due to self-interference between camera modules adjacent to each other.
- This Summary is provided to introduce a selection of concepts in a simplified form that are further described below in the Detailed Description. This Summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.
- An actuator having a structure provided with a magnet and a coil.
- A structure, capable of significantly reducing leakage of a magnetic field while employing an actuator using a magnetic field and a coil for miniaturization and accurate driving.
- A camera module that significantly reduces self-interference such that a plurality of camera modules may be freely arranged even when they are disposed adjacent to each other.
- In one general aspect, a camera module includes a carrier supported on a housing and movable in an optical axis direction, a frame supported on the carrier and movable, relative to the carrier, in a first direction, perpendicular to the optical axis direction, and a lens module supported on the frame and movable, relative to the frame, in a second direction, perpendicular to the optical axis direction. One of the frame and the lens module is supported such that attractive force acts in one of the first direction and the second direction.
- The other of the frame and the lens module may be arranged such that attractive force does not act between a relative member and the frame in one of the first direction and the second direction.
- The other of the frame and the lens module may be arranged such that attractive force acts between a relative member and the frame in the optical axis direction.
- The other of the frame and the lens module may include a driving magnet, and the driving magnet may be arranged to have an interval with a yoke, disposed on the relative member, in the optical axis direction.
- The housing may include a side surface on which one of the frame and the lens module is supported, and a yoke formed of a material configured to prevent leakage of a magnetic field may be disposed on the side surface.
- The frame may be supported such that attractive force acts with respect to the carrier in one of the first direction and the second direction, and the lens module maybe supported such that attractive force acts with respect to the frame in the optical axis direction.
- The frame may include a first magnet, the housing may include a first yoke, and the first magnet and the first yoke may be arranged to have an interval in the second direction.
- The frame may include a first magnet, and the first magnet may be magnetized along a surface opposing the carrier in one of the first direction and the second direction to have at least an N-pole and an S-pole.
- The lens module may include a second magnet, and a surface of the second magnet opposing the carrier may be magnetized to a single pole or a plurality of poles.
- The frame may include a first magnet and the lens module may include a second magnet, the first magnet may generate force such that the frame is moved relatively in a direction parallel to a surface opposing the carrier by interaction with a first coil, and the second magnet may generate force such that the lens module is moved relatively in a direction perpendicular to a surface opposing the frame by interaction with a second coil.
- The first magnet and the second magnet may be disposed to oppose each other about an optical axis.
- The lens module may include a second magnet to generate force to move the lens module, and one of a third magnet, independent of the second magnet, and a third yoke, and the frame may include the other of the third magnet and the third yoke to oppose the third magnet or the third yoke in the optical axis direction.
- The camera module may include three rolling members disposed between the lens module and a surface of the frame in the optical axis direction, and the second magnet may be disposed between two rolling members, among the three rolling members, and the third magnet or the third yoke may be disposed closest to the other rolling member.
- The three rolling members may be disposed to approximately form a right triangle.
- In another general aspect, a camera module includes a carrier supported on a housing and movable in an optical axis direction, a frame supported on the carrier and including a first magnet movable, relative to the carrier, in a first direction perpendicular to the optical axis direction, and a lens module supported on the frame and including a second magnet movable, relative to the frame, in a second direction perpendicular to the optical axis direction. One of the first magnet and the second magnet is magnetized along a surface opposing a relative member in one of the first direction and the direction to have at least an N-pole and an S-pole. The other of the first magnet and the second magnet is magnetized such that the surface opposing the relative member has a single pole or a plurality of poles.
- In another general aspect, a camera module includes an autofocusing part including a carrier disposed on a housing to be movable in an optical axis direction, a shake correction portion including a lens module to be movable, relative to the carrier, in a direction perpendicular to the optical axis direction, and an autofocusing coil to provide driving force to the autofocusing part, and first and second shake correction coils to provide driving force to the shake correction portion. The autofocusing coil and the first and second shake correction coils are each disposed on a surface of the housing disposed to be parallel to the optical axis direction. The housing includes a plurality of yokes, respectively covering the autofocusing coil and one of the first and second shake correction coils to prevent leakage of a magnetic field.
- In another general aspect, a camera module includes a frame including a first magnet to generate force to move the frame along a first direction perpendicular to an optical axis; a lens holder coupled to the frame and including a second magnet to generate force to move the lens holder relative to the frame along a second direction perpendicular to the optical axis, the second magnet being disposed opposite to the first magnet across the optical axis; and a lens barrel fixed to the lens holder to be moved along the first direction by movement of the frame and to be moved along the second direction by movement of the lens holder relative to the frame.
- One of the first magnet and the second magnet may be a polarizing magnet, and the other of the first magnet and the second magnet may be a single pole magnet.
- The camera module may include a first coil disposed to face the first magnet along the first direction; and a second coil disposed to face the second magnet along the first direction.
- The camera module may include a first yoke disposed to oppose the first magnet along the first direction such that the first coil is interposed between the first yoke and the first magnet; and a second yoke disposed to oppose the second magnet in a direction parallel to the optical axis.
- Other features and aspects will be apparent from the following detailed description, the drawings, and the claims.
-
FIG. 1 is an assembled perspective view of a camera module according to an example. -
FIG. 2 is an exploded perspective view of a camera module according to an example. -
FIG. 3 is an exploded perspective view of a housing and a carrier according to an example. -
FIG. 4 is an exploded perspective view of a housing, a carrier, a frame, and a lens module according to an example. -
FIG. 5 is an assembled perspective view of a housing, a carrier, a frame, and a lens module according to an example. -
FIG. 6 is an exploded perspective view of a housing, a carrier, a frame, and a lens holder according to an example, when viewed from above. -
FIG. 7 is an exploded perspective view of a housing, a carrier, a frame, and a lens holder according to an example, when viewed from below. - Throughout the drawings and the detailed description, the same reference numerals refer to the same elements. The drawings may not be to scale, and the relative size, proportions, and depiction of elements in the drawings may be exaggerated for clarity, illustration, and convenience.
- The following detailed description is provided to assist the reader in gaining a comprehensive understanding of the methods, apparatuses, and/or systems described herein. However, various changes, modifications, and equivalents of the methods, apparatuses, and/or systems described herein will be apparent to one of ordinary skill in the art. The sequences of operations described herein are merely examples, and are not limited to those set forth herein, but may be changed as will be apparent to one of ordinary skill in the art, with the exception of operations necessarily occurring in a certain order. Also, descriptions of functions and constructions that would be well known to one of ordinary skill in the art may be omitted for increased clarity and conciseness.
- The features described herein may be embodied in different forms, and are not to be construed as being limited to the examples described herein. Rather, the examples described herein have been provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to one of ordinary skill in the art.
- Herein, it is noted that use of the term “may” with respect to an example or embodiment, e.g., as to what an example or embodiment may include or implement, means that at least one example or embodiment exists in which such a feature is included or implemented while all examples and embodiments are not limited thereto.
- Throughout the specification, when an element, such as a layer, region, or substrate, is described as being “on,” “connected to,” or “coupled to” another element, it may be directly “on,” “connected to,” or “coupled to” the other element, or there may be one or more other elements intervening therebetween. In contrast, when an element is described as being “directly on,” “directly connected to,” or “directly coupled to” another element, there can be no other elements intervening therebetween.
- As used herein, the term “and/or” includes any one and any combination of any two or more of the associated listed items.
- Although terms such as “first,” “second,” and “third” may be used herein to describe various members, components, regions, layers, or sections, these members, components, regions, layers, or sections are not to be limited by these terms. Rather, these terms are only used to distinguish one member, component, region, layer, or section from another member, component, region, layer, or section. Thus, a first member, component, region, layer, or section referred to in examples described herein may also be referred to as a second member, component, region, layer, or section without departing from the teachings of the examples.
- Spatially relative terms such as “above,” “upper,” “below,” and “lower” may be used herein for ease of description to describe one element's relationship to another element as shown in the figures. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, an element described as being “above” or “upper” relative to another element will then be “below” or “lower” relative to the other element. Thus, the term “above” encompasses both the above and below orientations depending on the spatial orientation of the device. The device may also be oriented in other ways (for example, rotated 90 degrees or at other orientations), and the spatially relative terms used herein are to be interpreted accordingly.
- The terminology used herein is for describing various examples only, and is not to be used to limit the disclosure. The articles “a,” “an,” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms “comprises,” “includes,” and “has” specify the presence of stated features, numbers, operations, members, elements, and/or combinations thereof, but do not preclude the presence or addition of one or more other features, numbers, operations, members, elements, and/or combinations thereof.
- Due to manufacturing techniques and/or tolerances, variations of the shapes shown in the drawings may occur. Thus, the examples described herein are not limited to the specific shapes shown in the drawings, but include changes in shape that occur during manufacturing.
- The features of the examples described herein may be combined in various ways as will be apparent after an understanding of the disclosure of this application. Further, although the examples described herein have a variety of configurations, other configurations are possible as will be apparent after an understanding of the disclosure of this application.
- Hereinafter, while examples of the present disclosure will be described in detail with reference to the accompanying drawings, it is noted that examples are not limited to the same.
- The present disclosure relates to a camera module, and may be applied to portable electronic devices such as mobile communications terminals, smartphones, table PCs, and the like.
- A camera module is an optical device for capturing still or moving images. A camera module may include a lens, refracting light reflected from a subject, and a lens driving device moving the lens to adjust a focus or to compensate for the shaking of the camera module while images are captured.
-
FIG. 1 is an assembled perspective view of a camera module according to an example, andFIG. 2 is an exploded perspective view of a camera module according to an example. - Referring to
FIGS. 1 and 2 , acamera module 1000 may include ahousing 1100, alens module 1500 including alens barrel 1510 accommodated in thehousing 1100, a lens driving device moving thelens module 1500, and animage sensor unit 1150 converting light, incident through thelens barrel 1510, into an electrical signal. Thecamera module 1000 may further include acase 1110 or anupper cover 1301 covering thehousing 1100 from above. - The
lens barrel 1510 may be a hollow cylindrical shape allowing a plurality of lenses for capturing a subject to be accommodated therein (the configuration is not limited thereto, and thelens barrel 1510 may have a partially cut exterior, and the inside of thelens barrel 1510 may be provided with a circular lens or a D-cut lens, a lens having one partially cut side), and a plurality of lenses are mounted in thelens barrel 1510. The plurality of lenses is arranged in an amount as large as necessary depending on a design of thelens barrel 1510, and each of the plurality of lenses has the same or different optical characteristics such as the a refractive index, or the like. - The lens driving device moves the
lens barrel 1510 in an optical axis direction or a direction perpendicular to the optical axis direction. - As an example, the lens driving device may move the
lens barrel 1510 in an optical axis direction (a Z-axis direction) to adjust a focus, and may move thelens barrel 1510 in X-axis and Y-axis directions, perpendicular to the optical axis direction (the Z-axis direction), to correct shaking at the time of capturing an image. - The lens driving device includes a focusing unit (an autofocusing part) and a shake correction unit (a shake correction portion).
- The
image sensor unit 1150 converts light, incident through thelens barrel 1510, into an electrical signal. - As an example, the
image sensor unit 1150 may include animage sensor 1151 and a printed circuit board (PCB) 1153 connected to theimage sensor 1151, and may further include an infrared filter. - The
lens module 1500, including thelens barrel 1510, and the lens driving device are accommodated in thehousing 1100. - As an example, the
housing 1100 has a shape with an open top and bottom, and thelens module 1500 and the lens driving device may be accommodated in an internal space of thehousing 1100. Theimage sensor unit 1150 is disposed below thehousing 1100. - The
case 1110 is coupled to thehousing 1100 to surround an external surface of thehousing 1100, and serves to protect internal components of thecamera module 1000. Thecase 1110 may serve to shield electromagnetic waves. - As an example, the
case 1100 may shield electromagnetic waves generated by thecamera module 1000 such that electromagnetic waves do not affect other electronic components in the portable electronic device. - Since a portable electronic device is equipped with various electronic components other than the
camera module 1000, thecase 1100 may shield electromagnetic waves generated by such electronic components such that the electromagnetic waves do not affect thecamera module 1000. - Referring to
FIGS. 2 and 3 , the focusing unit of the lens driving device according to an example is illustrated. - The lens driving device includes a focusing unit, moving a
carrier 1300 in an optical axis direction to perform autofocusing, and a shake correction unit moving thelens module 1500 disposed inside of thecarrier 1300 in a direction perpendicular to the optical axis direction, to perform shake correction. - The focusing unit has a structure generating driving force to move the
carrier 1300, accommodating thelens module 1500, in the optical axis direction (the Z-axis direction). - A driving portion of the focusing unit includes a
magnet 1320 and acoil 1330. Themagnet 1320 is mounted on thecarrier 1300. As an example, themagnet 1320 may be mounted on one surface of thecarrier 1300. - The
coil 1330 is mounted in thehousing 1100. As an example, thecoil 1330 may be mounted in thehousing 1100 through asubstrate 1130. Thecoil 1330 may be fixed to thesubstrate 1130, and thesubstrate 1130 may be fixed to thehousing 1100 in a state in which fixing driving coils of the shake correction unit to described later are also fixed together. - The
magnet 1320 is a movable member mounted on thecarrier 1300 to move in the optical axis direction (the Z-axis direction) together with thecarrier 1300, and thecoil 1330 is a fixed member fixed to thehousing 1100. However, the configuration is not limited thereto, and positions of themagnet 1320 and thecoil 1330 are interchangeable with each other. - When power is applied to the
coil 1330, thecarrier 1300 may be moved in the optical axis direction (the Z-axis direction) by electromagnetic interaction between themagnet 1320 and thecoil 1330. - Since the
lens barrel 1510 is accommodated in thecarrier 1300, thelens barrel 1510 is also moved in the optical axis direction (the Z-axis direction) by the movement of thecarrier 1300. - When the
carrier 1300 is moved, a rollingmember 1370 is disposed between thecarrier 1300 and thehousing 1100 to reduce friction between thecarrier 1300 and thehousing 1100. The rollingmember 1370 may have a ball shape.Rolling members 1370 may be disposed on both sides of themagnet 1320. - A
yoke 1350 is disposed in thehousing 1100. For example, theyoke 1350 is disposed to oppose themagnet 1320 with thecoil 1330 interposed therebetween. For example, thecoil 1330 and themagnet 1320 are disposed to oppose each other, and theyoke 1350 is disposed on a rear surface of thecoil 1330 such that thecarrier 1300 is closely supported on thehousing 1100 with the rollingmember 1370 interposed therebetween. - Attractive force acts between the
yoke 1350 and themagnet 1320 in a direction perpendicular to the optical axis direction (the Z-axis direction). Accordingly, the rollingmember 1370 may be maintained in a state of contact with thecarrier 1300 and thehousing 1100 by the attractive force between theyoke 1350 and themagnet 1320. - The
yoke 1350 may also serve to focus magnetic force of themagnet 1320, and may prevent magnetic flux from leaking outwardly. - The example uses a closed loop control method in which a position of the
lens barrel 1510, in further detail, thecarrier 1300, is detected and feed-backed. - Accordingly, a
position sensor 1360 is required for closed loop control. Theposition sensor 1360 may be a hall sensor. - The
position sensor 1360 is disposed inside or outside of thecoil 1330. Theposition sensor 1360 may be mounted on thesubstrate 1130 on which thecoil 1330 is mounted. - A magnet and a coil may be additionally provided to secure sufficient driving force during focusing. When an area, in which a magnet is mounted, is reduced with the trend for slimming of a camera module, a size of the magnet is decreased, and thus, sufficient driving force required for focusing may not be secured.
- According to the present example, although not illustrated, magnets may be respectively attached to the different surface of the
carrier 1300 and coils may be respectively provided on different surfaces of thehousing 1100 to oppose the magnet. Thus, sufficient driving force for focusing may be secured even when a camera module is slimmed. - Referring to
FIGS. 2 to 7 , a shake correction unit of the lens driving device according to an example is illustrated. - The lens driving device includes a focusing unit, moving the
carrier 1300 in an optical axis direction to perform focusing, and a shake correction unit moving thelens module 1500 disposed inside of thecarrier 1300 in a direction perpendicular to the optical axis direction, to perform shake correction. - The shake correction unit has a structure generating driving force to move the
lens module 1500, accommodated in thecarrier 1300, in a first direction (an X-axis direction) and a second direction (a Y-axis direction), perpendicular to the optical axis direction (the Z-axis direction). The first direction and the second direction are perpendicular to each other. - The shake correction unit is used to correct image blurring or video shaking caused by user hand-shake, or the like, when an image or a video is captured. For example, when the shake occurs due to user hand-shake, or the like, at the time of capturing an image, a relative displacement corresponding to the shake is provided to the
lens barrel 1510 to correct the shaking. As an example, the shake correction unit corrects the shaking by moving thelens barrel 1510 in a direction perpendicular to an optical axis (a Z axis). - The shake correction unit includes a
frame 1400 and thelens module 1500 sequentially provided in thecarrier 1300. Thelens module 1500 includes alens holder 1700 to which thelens barrel 1510 is coupled. Thecarrier 1300 may include theupper cover 1301 covering theframe 1400 and thelens module 1500 from above while they are disposed inside of thecarrier 1300. - The shake correction unit according to this example may implement a structure in which the
lens barrel 1510 may be moved as theframe 1400 and thelens holder 1700 are moved in the second direction (the Y-axis direction) and the first direction (the X-axis direction), respectively. - For example, the
lens holder 1700, to which thelens barrel 1510 is fixed, is moved as theframe 1400 is moved in the second direction (the Y-axis direction) or thelens holder 1700 is moved in the first direction (the X-axis direction). For example, since thelens barrel 1510 is fixed to thelens holder 1700, thelens barrel 1510 is moved together with the movement of thelens holder 1700 and thelens barrel 1510 is a member moved while thelens holder 1700 is supported on theframe 1400. Therefore, thelens barrel 1510 is naturally moved together with theframe 1400 even when theframe 1400 is moved. - Due the above structure, when the
frame 1400 is moved in the second direction (the Y-axis direction) or thelens holder 1700 is moved in the first direction (the X-axis direction), thelens barrel 1510 is moved together to correct shaking. - A driving portion of the shake correction unit includes a first driving portion, driving the
frame 1400, and a second driving portion driving thelens holder 1700. Theframe 1400 is driven while being in closely supported on a surface disposed to be parallel to the optical axis direction of thecarrier 1300, and thelens holder 1700 is driven while being closely supported on a surface perpendicular to the optical axis direction. For example, in a relationship to a relative member, only theframe 1400 is closely supported in a direction perpendicular to the optical axis direction, and thelens holder 1700 may not be closely supported in the direction perpendicular to the optical axis direction, but may be closely supported on a surface disposed to be parallel to the optical axis direction. - The
frame 1400 includes afirst magnet 1420. Thefirst magnet 1420 is disposed to oppose afirst coil 1430, provided in thehousing 1100, in a first direction (an X-axis direction) perpendicular to the optical axis direction. - In addition, the
first magnet 1420 is magnetized to have at least N and S poles in a second direction (a Y-axis direction) perpendicular to a direction opposing the first coil 1430 (for example, thefirst magnet 1420 is magnetized such that a surface opposing thefirst coil 1430 has at least N and S poles in a direction perpendicular to the optical axis). Accordingly, when power is applied to thefirst coil 1430, force is generated to move theframe 1400 in the second direction (the Y-axis direction) depending on electromagnetic interaction of thefirst magnet 1420 and thefirst coil 1430. - The
lens holder 1700 is provided with asecond magnet 1720. Thesecond magnet 1720 is disposed to oppose asecond coil 1730, provided in thehousing 1100, in the first direction (the X-axis direction) perpendicular to the optical axis direction. For example, thefirst magnet 1420 and asecond magnet 1720 are disposed to be substantially parallel to each other. Accordingly, thefirst magnet 1420 and thesecond magnet 1720 may be disposed to oppose each other about the optical axis. - The
second magnet 1720 may be magnetized such that a surface, opposing thesecond coil 1730, has a single pole of an N or S pole or a plurality of poles including the N and S poles. When power is applied to thesecond coil 1730, force is generated to move thelens holder 1700 in the first direction (the X-axis direction) by force to push or pull thesecond magnet 1720 and thesecond coil 1730 in direction opposing each other according to electromagnetic interaction of thesecond magnet 1720 and thesecond coil 1730. - The
first coil 1430 and thesecond coil 1730 are fixed to thesubstrate 1130 together with the drivingcoil 1330 of the focusing unit, and thesubstrate 1130 is fixed to thehousing 1100. - The
frame 1400 is closely supported on a sidewall of thecarrier 1300, for example, a surface disposed to be parallel to the optical axis direction, and thelens holder 1700 is closely supported on a surface of theframe 1400 in the optical axis direction, for example, a surface perpendicular to the optical axis direction. - The
frame 1400 is supported on the sidewall of thecarrier 1300 by attractive force with afirst yoke 1450 provided in thehousing 1100. Since thefirst yoke 1450 may be a metallic or non-metallic magnetic material to shield a magnetic field, magnetic flux generated by a coil, a magnet, or an interaction thereof may be prevented from leaking outwardly of thecamera module 1000. - The
lens holder 1700 is supported on an upper surface (bottom) of theframe 1400 in the optical axis direction by attraction force with asecond yoke 1750 provided in theframe 1400. - The
first yoke 1450 is disposed to oppose thefirst magnet 1420 in the direction perpendicular to the optical axis direction, with the first coil 1410 interposed therebetween, and thesecond yoke 1750 is disposed to oppose the second magnet 1710 in the optical axis direction. - The
first yoke 1450 may be disposed on a rear surface of thefirst coil 1430, and may allow theframe 1400 to be closely supported on an internal wall of thecarrier 1300 in the direction perpendicular to the optical axis direction, by the attractive force with thefirst magnet 1420. - The
second yoke 1750 may allow thelens holder 1700 to be closely supported on an upper surface (a bottom surface) of theframe 1400 in the optical axis direction by the attractive with thesecond magnet 1720. Since thesecond yoke 1750 and thesecond magnet 1720 are provided on only a portion based on the circumference of theframe 1400, thelens holder 1700 may be eccentrically supported on theframe 1400. Thus, athird yoke 1650 and athird magnet 1620 may be selectively provided on thelens holder 1700 and theframe 1400, respectively, to oppose each other in the optical axis direction. - The
frame 1400 may include afirst rolling member 1470 between and internal wall surface of the carrier 1300 (a surface disposed to be parallel to the optical axis direction) and theframe 1400 to be easily moved on the internal wall of thecarrier 1300 in a sliding or rolling motion. Thelens holder 1700 may include asecond rolling member 1770 between a surface perpendicular to theframe 1400 in the optical axis direction and thelens holder 1700 to be easily moved in a sliding or rolling motion on an upper surface of theframe 1400. - A surface, on which the
frame 1400 and the internal wall of thecarrier 1300 oppose each other, may be provided with afirst guide groove 1475 formed to be elongated in the second direction (the Y-axis direction) such that the first rolling member 2470 is easily moved in a sliding or rolling motion on at least one of the surfaces. A surface, on which thelens holder 1700 and theframe 1400 oppose each other, may be provided with asecond guide groove 1775 formed to be elongated in the first direction (the X-axis direction) such that thesecond rolling member 1770 is easily moved in a sliding or rolling motion on at least one of the surfaces. - The
first rolling member 1470 may be provided with one or twofirst magnets 1420 on external sides of both end portions thereof, respectively, to form a triangle or a quadrangle. Each first rollingmember 1470 may be provided with at least one rolling member in eachfirst guide groove 1475. - The
second rolling member 1770 is provided with a total of three or four rolling members, including two rolling members respectively disposed on both sides of thesecond magnet 1720, to form a triangle or a quadrangle. Eachsecond rolling member 1770 may be provided with at least one rolling member in eachsecond guide groove 1775. When threesecond rolling members 1770 are provided to form a triangle, they may be arranged to form an approximately right triangle. Thesecond magnet 1720 may be provided between twosecond rolling members 1770, among the threesecond rolling members 1770, to balance suction force in the optical axis direction, and thethird magnet 1620 or thethird yoke 1650 may be provided to be closest to the remaining onesecond rolling member 1770. - The first and
second magnets second frames second coils second magnets housing 1100. For ease of description, in a portion of the drawings, the first andsecond coils carrier 1300. However, referring toFIG. 2 , both of the first andsecond coils housing 1100. - The first and
second magnets lens module 1500 in a direction perpendicular to the optical axis (the Z-axis), and the first andsecond coils housing 1100. However, the configuration is not limited thereto, and positions of the first andsecond magnets second coils - The shake correction driving unit may use a closed loop control method in which the positions of the
frame 1400 and thelens holder 1700 are continuously sensed and reflected on driving. Accordingly, theframe 1400 and thelens holder 1700 may include first andsecond position sensors second magnets frame 1400 and thelens holder 1700. In this case, the first andsecond position sensors second coils substrate 1130. - This example includes all structures in which one or two or more first and
second coils second magnets frame 1400 and thelens holder 1700, are provided, respectively. When two or more first andsecond coils - In the
camera module 1000 according to this example, side surfaces of thehousing 1100 using a VCM actuator using a magnet and a coil may all be finished with a yoke, capable of preventing leakage of magnetic flux. As a result, leakage of a magnetic field may be effectively prevented. - The
camera module 1000 according to this example has a structure in which thehousing 1100, thecarrier 1300, theframe 1400 and thelens module 1500 are sequentially provided in the optical axis direction, thecarrier 1300 is moved in the optical axis direction to implement an autofocusing (AF) function, and theframe 1400 and thelens module 1500 are moved in the first direction and the second direction, perpendicular to the optical axis, from an upper portion of thecarrier 1300 to implement optical image stabilization (OIS). - To implement the optical image stabilization (OIS), the
frame 1400 is moved in a second direction, perpendicular to the optical axis (the Y-axis direction), while being supported on the sidewall of thecarrier 1300 parallel to the optical axis direction, and the lens module 1500 (in further detail, thelens barrel 1510 or the lens holder 1700) is moved in the first direction (the X-axis direction), perpendicular to the optical axis direction, while being supported on a bottom surface perpendicular to the optical axis direction of theframe 1400. - However, the configuration is not limited thereto. To implement optical image stabilization (OIS) according to another example, directions or surfaces of the
frame 1400 and thelens module 1500 are interchangeable with each other. - For example, to implement optical image stabilization (OIS) according to another example, the
frame 1400 may be moved in the second direction (the Y-axis direction), perpendicular to the optical axis, while being supported on a bottom surface, a surface perpendicular to the optical axis direction of thecarrier 1300, and the lens module 1500 (in further detail, thelens barrel 1510 or the lens holder 1700) may be moved in the first direction (the X-axis direction), perpendicular to the optical axis, while being supported on the sidewall of theframe 1400 parallel to the optical axis direction. - In this case, the
first magnet 1420 provided in theframe 1400 may be magnetized to an N-pole or an S-pole of a single-pole magnet, or a plurality of poles including the N-pole and the S-pole, and may allow attractive force or repulsive force to be generated between thefirst coil 1430, provided in thehousing 1100, and thefirst magnet 1420 in directions opposing each other. Thus, force may be generated to move theframe 1400 in the first direction (the X-axis direction), thesecond magnet 1720 provided in thelens module 1500 may use a magnet magnetized to multiple poles including N-pole and S-pole in the direction, perpendicular to the optical axis direction, and thelens module 1500 may be moved along a surface, opposing thesecond coil 1730 provided in thehousing 1100, in the second direction (the Y-axis direction) perpendicular to the optical axis direction. - In this case, the
housing 1100 may be provided with a yoke covering thesecond coil 1730, and thesecond magnet 1720 provided in thelens module 1500 may be closely supported on a sidewall of theframe 1400, for example, a surface disposed to be parallel to the optical axis direction, by attractive force with the yoke. However, since theframe 1400 should be movable in a direction parallel to the direction in which theframe 1400 is closely supported, force significantly greater than attractive force between thelens module 1500 and theframe 1400 may be required by interaction between thefirst magnet 1420 and thefirst coil 1430. Alternatively, a yoke may be provided on theframe 1400, a movable member, rather than thehousing 1100, to prevent attractive force between the yoke and thesecond magnet 1720 from affecting movement of theframe 1400. - In addition, the
frame 1400 may be provided with a rolling member interposed between thecarrier 1300 and a surface perpendicular to the optical axis direction, and thelens module 1500 may be provided with a rolling member interposed between theframe 1400 and the surface perpendicular to the optical axis direction. - Detailed descriptions of other examples are omitted, but an overall structure of a camera module may be modified with reference to a structural concept of the
camera module 1000. - As described above, leakage of a magnetic field may be significantly reduced while employing an actuator using a magnet and a coil. Thus, miniaturization and accuracy in driving of a camera module may be implemented.
- In addition, even when camera modules are arranged to be adjacent to each other, magnetic field interference may be significantly reduced. Thus, the camera modules may be freely arranged.
- While this disclosure includes specific examples, it will be apparent after an understanding of the disclosure of this application that various changes in forms and details may be made in these examples without departing from the spirit and scope of the claims and their equivalents. The examples described herein are to be considered in a descriptive sense only, and not for purposes of limitation. Descriptions of features or aspects in each example are to be considered as being applicable to similar features or aspects in other examples. Suitable results may be achieved if the described techniques are performed in a different order, and/or if components in a described system, architecture, device, or circuit are combined in a different manner, and/or replaced or supplemented by other components or their equivalents. Therefore, the scope of the disclosure is defined not by the detailed description, but by the claims and their equivalents, and all variations within the scope of the claims and their equivalents are to be construed as being included in the disclosure.
Claims (20)
Applications Claiming Priority (2)
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KR1020190164032A KR102272591B1 (en) | 2019-12-10 | 2019-12-10 | Camera module |
KR10-2019-0164032 | 2019-12-10 |
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US20210173223A1 true US20210173223A1 (en) | 2021-06-10 |
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US16/924,331 Active 2042-05-10 US11885977B2 (en) | 2019-12-10 | 2020-07-09 | Camera module |
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CN113900212A (en) * | 2021-10-29 | 2022-01-07 | 河南皓泽电子股份有限公司 | Lens driving mechanism |
US20220155652A1 (en) * | 2020-11-18 | 2022-05-19 | Samsung Electro-Mechanics Co., Ltd. | Camera module |
US11860512B2 (en) | 2019-12-10 | 2024-01-02 | Samsung Electro-Mechanics Co., Ltd. | Camera module |
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KR102597176B1 (en) * | 2021-11-15 | 2023-11-02 | 삼성전기주식회사 | sensor shifting module and camera module having the same |
KR102597173B1 (en) * | 2021-11-23 | 2023-11-02 | 삼성전기주식회사 | sensor shifting module and camera module having the same |
KR102597174B1 (en) * | 2021-11-23 | 2023-11-02 | 삼성전기주식회사 | sensor shifting module and camera module having the same |
WO2023132593A1 (en) * | 2022-01-07 | 2023-07-13 | 엘지이노텍 주식회사 | Lens driving device and camera device |
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Also Published As
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KR102272591B1 (en) | 2021-07-05 |
CN212723615U (en) | 2021-03-16 |
US11885977B2 (en) | 2024-01-30 |
CN113050341B (en) | 2022-12-13 |
KR20210073324A (en) | 2021-06-18 |
CN113050341A (en) | 2021-06-29 |
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